Fix Codebuff OAuth: use www.codebuff.com (307 redirect on bare domain)

src/codex-launcher-gui

@@ -393,7 +393,7 @@ PROVIDER_PRESETS = {
     },
     "Codebuff (Free DeepSeek/Kimi)": {
         "backend_type": "codebuff",
-        "base_url": "https://codebuff.com",
+        "base_url": "https://www.codebuff.com",
         "oauth_provider": "codebuff",
         "models": [
             "deepseek/deepseek-v4-pro", "deepseek/deepseek-v4-flash",
@@ -3685,7 +3685,7 @@ class EditEndpointDialog(Gtk.Dialog):
         def _codebuff_auth_thread():
             try:
                 fingerprint_id = str(uuid.uuid4())
-                auth_url = "https://codebuff.com/api/auth/cli/code"
+                auth_url = "https://www.codebuff.com/api/auth/cli/code"
                 body = json.dumps({"fingerprintId": fingerprint_id}).encode()
                 req = urllib.request.Request(auth_url, data=body,
                     headers={"Content-Type": "application/json", "User-Agent": "codex-launcher/3.10.5"})
@@ -3707,7 +3707,7 @@ class EditEndpointDialog(Gtk.Dialog):
 
                 webbrowser.open(login_url)
 
-                poll_url = f"https://codebuff.com/api/auth/cli/status?fingerprintId={urllib.parse.quote(fingerprint_id)}&fingerprintHash={urllib.parse.quote(fingerprint_hash)}&expiresAt={expires_at}"
+                poll_url = f"https://www.codebuff.com/api/auth/cli/status?fingerprintId={urllib.parse.quote(fingerprint_id)}&fingerprintHash={urllib.parse.quote(fingerprint_hash)}&expiresAt={expires_at}"
                 deadline = time.time() + 300
                 while time.time() < deadline:
                     time.sleep(2)

src/translate-proxy.py

@@ -294,7 +294,7 @@ _conn_pool = {}
 
 _STREAM_IDLE_TIMEOUT = 300
 
-_CODEBUFF_AUTH_URL = "https://codebuff.com"
+_CODEBUFF_AUTH_URL = "https://www.codebuff.com"
 _CODEBUFF_API_URL = "https://www.codebuff.com"
 _CODEBUFF_AGENT_MAP = {
     "deepseek/deepseek-v4-pro": "base2-free-deepseek",